Just wondering what brand of thermal underwear everyone uses during the cold winter months? I have some from Target and they keep my upper body warm, but they don't seem to be the best option for my legs. I don't like to be bulky so I only wear the thermals and jeans.

Unfortunately, Duofold changed the men's bottoms and eliminated the fly so the last couple of bottoms that I've bought are Ice Breakers, which are 100% merino wool.....but I don't think they're as warm as the Duofolds which are heavier and a 40% wool blend. The Ice Breakers are more expensive. I still buy the Duofold tops, but not the bottoms.

Hot Chili's are very popular as well, and don't over look the Smart Wool brand either.

I have worn every type and combination of longies you can imagine, silk, cotton, wool, polyproylene. I liked polypropylene the best, until I choked down my resistance and spent the money on under armour, I won't wear anything else.

I like polypropylene. I have a pair by Terramar and a pair by Under Armour. I got mid-weight in the Terramar and heavy-weight in the Under Armour.

Yesterday, hiking to and from an upper run in shed, the windward side of my jeans were coated in snow. My legs were still warm and when the snow melted as I drove to the next feed ground I didn't get chilled.

PolarTec. They sell military grade "warmth gear". I have a pair of pants and a shirt from them. I typically gauge warmth off pants though because you can only layer so much there. 50 to upper 30's degrees I can get away with my under armor. Between 35ish and 20 I use the PolarTec pants. 19 and below I wear both. Yesterday it was 20 degrees out (less with the wind chill) and I went on a two hour trail ride and minimally felt the cold with the under armor and PolarTec pants under my old navy jeans (not very thick). They are also VERY good at moisture wicking. I wore the shirt with a wind breaker over (it was in the 40s I think) and when I took the wind breaker off the inside was wet and I was confused. The only thing that made sense is that the shirt pulled the moisture off my body before I even felt like I was sweating!!Posted via Mobile Device

Pure wool. Mine are a light knit that is machine washable. They aren't bulky. Wool is the best. I learned this from the bush workers who are out in brutal cold. It breathes like synthetics can't. They wear wool longs under loose wool melton pants. On top, same thing under a wool jacket. I have a heavy wool sweater and it is often warmer than my layered jacket that's rated for -40.

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